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Nothing  The sub will not sink if left alone. The sub is displacing half of the two pounds it would displace when completely submerged. That's why half of it is submerged and the other half is out of the water. Try Again Stories in the Timber | Explore the Shipwreck | Who Owns Lost Ships? Buoyancy Brainteasers | Teacher's Guide | Resources | Transcript | Site Map Voyage of Doom Home Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule About NOVA | Teachers | Site Map | Shop | Jobs | Search | To print PBS Online | NOVA Online | WGBH © | Updated November 2000 |